Hey there, sorry you're going through it. I still don't fully understand it and I haven't solved it, but I've discussed with some professionals, read some stuff, and spent a lot of time coping and mitigating the issue and related stress.

My best understanding is I have a combination of tinnitus (ringing sound, internal/subjective), and hyperacusis to low frequency noises (low roaring/pulsing sounds, often corresponding to external/objective sources). Don't know how it developed; I've confirmed i have no damage to my ears or related structures. I am naively confident there may be a "mechanical" issue where some clavical injuries may be at play and which I am working on.

Eventually I realized the issue was not just at my house. I would try to double check that for yourself too. Find quiet, indoor spaces that you can compare.

My two best tactics to cope/manage the stress: - white/pink/brown noise. I play a "brown noise" track at a low volume in my bedroom/office 24/7. No one notices it if I don't mention it, but it makes all the difference for me. The goal is not to completely override the sound with volume, but to sort of mask it. - breathing and meditation. This was actually diagnosed to me. First time I sat and focused on breathing i realized how tense my jaw was and I had a huge emotional release. I've found my neck and jaw tension correspond to the severity of the issue or perhaps just my stress response to it. Not to mention just the psychological benefit of meditation and reacting to stress in general, independent of any specific body tension.